The three Star Trek series set in the 24th century and
Star Trek Enterprise include many references to The Original Series, the
one that started it all. The verbal references are almost too numerous to list.
Some episodes feature characters from TOS or even time travels such as
"Trials and Tribble-ations" and "In a Mirror, Darkly" and
are naturally full of references. Our small article, however, spotlights casual
appearances of props and graphics from TOS in the later series. In other words,
this is about homages rather than TOS style that was recreated for continuity's
sake.

Ship
Miniatures and Props

Constitution class
(original) Besides the relief
in the observation lounge of the Enterprise-D, a model of the original Enterprise as
it appeared in TOS can be seen in Wesley's quarters on Earth in TNG: "The
First Duty" and in Admiral Leyton's office in Starfleet Headquarters in
DS9: "Paradise Lost", the latter among other starship models.

Shuttlecraft We
can see a model of the Galileo shuttlecraft in Commander Riker's quarters in
TNG: "Lonely Among Us".

Daedalus class The
design of the Daedalus class is
based on sketches by Matt Jefferies. We can first see the model in Keiko's
classroom in DS9: "The Nagus". Since DS9: "Progress" it can
be found in Sisko's office. While the design itself never showed up in TOS, the
name "Horizon" indicates that it is the very ship that visited Sigma
Iotia II in TOS: "A Piece of the Action".

Botany Bay
A
ship of the DY-100 class such as Khan's Botany Bay from TOS: "Space
Seed", together with so far unseen booster rockets, is visible in Rain
Robinson's office in VOY: "Future's End". A photo of this
configuration can be seen in the bar in ENT: "First Flight" and
"Home".

Nomad Ensign
Mayweather has a model of the space probe Nomad in his quarters, as is visible
in ENT: "Dead Stop". This miniature is based on the original
appearance of the probe, as it was shown on a diagram
in TOS: "The Changeling".

TOS Items
on Displays

Constitution class (original)
In TNG: "Datalore" we can briefly see two views of an original
Constitution class on an LCARS display, among many other items.

TOS planet names For
TNG: "Conspiracy" a star chart was created by Mike Okuda that comprised all planets
seen and mentioned in TOS and TAS. This chart can be seen again in several more episodes, such as
"The Emissary", "The Measure of a Man", "The Game"
and "The Mind's Eye". It also appears in the classroom aboard Deep Space 9, featuring the heading "The Explored Galaxy", in "In the Hands of the Prophets" and "Cardassians".
In addition to episodic Star Trek, it can be seen in Captain Kirk's quarters aboard the USS Enterprise-A in "Star Trek VI: The Undiscovered Country".

TOS planet
surfaces Since the second season the monitors of the promenade deck
on Deep Space 9 shows advertisements for several planets that we know from
TOS. Each ad includes a picture of the planet and a brief text. The video that
is shown in an infinite loop depicts Eminiar VII ("A Taste of
Armageddon"), Rigel VII ("The Cage"), Stratos ("The Cloud
Minders") and Pollux IV ("Who Mourns for Adonais?"). We can see
the ads in "Whispers", "Rapture", "A Simple
Investigation" and "Chrysalis", for example.

TOS lifeforms
For DS9: "A Man Alone" Doug Drexler created
a graphic display with several non-humanoid lifeforms from TOS. All depictions
are based on drawings that he made for the Star Fleet Medical Reference
Manual from 1977. On the big chart the following lifeforms are depicted:
Denebian slime devils, Regulan bloodworms (both never shown but mentioned in
"The Trouble with Tribbles"), Tribbles,
Excalbians ("The Savage Curtain"), the Horta ("Devil in the
Dark"), neural parasites ("Operation - Annihilate!"), Korob's and
Sylvia's species ("Catspaw"). We can also read the names of the home
planets of the creatures. The Latin name "polygeminus grex" and the
home planet Iota Geminorum IV of the Tribbles have earned canon status thanks to
this chart.

The same school chart can be seen again in DS9: "The
Nagus". On some more occasions we can see depictions of single species.
Korob's and Sylvia's species is visible on PADDs in DS9: "The Nagus"
and "If Wishes Were
Horses". Neural parasites and Regulan bloodworms
repeatedly appear on monitors in Bashir's infirmary in the first season. The
depiction of the Tribbles shows up in "Star Trek Generations" in an
exploding lab.

TOS illnesses On the
monitors of Cold Station 12 in the ENT episode of the same name we can see several references to illnesses from TOS,
such as Rigelian fever ("Requiem for Methuselah"), synthococcus novae
("The Way to Eden") and xenopolycythemia ("For the World is
Hollow and I Have Touched the Sky").

Miscellaneous

TOS-style
interfaces Three episodes of modern Trek series and movies feature
interfaces or consoles as they could be found on the bridge of the original
starship Enterprise.

In "Generations" the interior of the Amargosa
station is amazingly TOS-like, although the station is probably meant to be a design
of the 24th century. We can see consoles with colorful transparent buttons as in
TOS, and screens with blue frames and with star charts just as the ones in TOS. Furthermore, the station has
intercoms and door signs that look like the ones on the original Enterprise.

The Xhosa,
the ship of Kasidy Yates, too has TOS-style interfaces in red, yellow and green
and screens with blue frames, as can be seen in DS9: "For the Cause". Finally, two of Giger's consoles are TOS-like in
DS9: "In the Cards".

Handbook of Exobiology
This book, as it is visible in ENT: "Strange New World", cites
Hodgkin's Law of Parallel Development (TOS: "Bread and Circuses").
It shows a
Kaferian apple (from "Where No Man Has Gone Before") and a Talosian
singing plant (from "The Cage") on its cover. See also on Geoffrey
Mandel's website.

Chicago Mobs of the Twenties
Another edition of the infamous book from TOS: "A Piece of the Action" can be seen on a
shelf in ENT: "Horizon". Only that the Mayweathers' copy is named
"Chicago Gangs". This begs the question which one of the two is a
rip-off.

Saurian brandy The
characteristic bottles from TOS episodes such as "Charlie X",
"Journey to Babel" and "By Any Other Name" show up in DS9 as
well. They are visible in "Facets", "Behind the Lines",
"Who Mourns for Mourn?" and "Prodigal Daughter".

Triskelion logo The characteristic
logo from TOS: "The Gamesters of Triskelion" appears as a freight
label in various DS9 episodes, such as "Necessary Evil", "Family
Business", "Favor the Bold" and "Resurrection".